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Business Acquisition (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 11, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]            
Payments to acquire businesses, gross $ 365,000          
Cash 119          
Other current assets 9,315          
Current assets 9,434          
Property, plant & equipment 4,036          
Deferred income taxes 80          
Goodwill   $ 615,768   $ 615,768   $ 400,440
Other non-current assets 166          
Total assets acquired 369,509          
Current liabilities assumed 4,462          
Total liabilities assumed 4,462          
Net assets acquired 365,047          
Goodwill, expected tax deductible amount 215,800          
Net sales   233,590 $ 211,421 695,250 $ 645,101  
Net income (loss)   8,675 (140) 26,045 (1,459)  
Net sales   233,590 202,307 690,232 617,191  
Cost of Sales            
Business Acquisition [Line Items]            
Business acquisition costs   171 0 1,335 0  
Selling and Administrative Expenses            
Business Acquisition [Line Items]            
Business acquisition costs   1,490 1,073 11,196 1,073  
Buffalo Filter LLC            
Business Acquisition [Line Items]            
Goodwill $ 215,793          
Weighted average amortization period (in years) 16 years          
Net sales   $ 13,900   $ 33,400    
Customer relationships            
Business Acquisition [Line Items]            
Intangible assets $ 124,000          
Customer relationships | Buffalo Filter LLC            
Business Acquisition [Line Items]            
Weighted average amortization period (in years) 16 years          
Developed technology            
Business Acquisition [Line Items]            
Intangible assets $ 9,000          
Developed technology | Buffalo Filter LLC            
Business Acquisition [Line Items]            
Weighted average amortization period (in years) 10 years          
Trademarks & tradenames            
Business Acquisition [Line Items]            
Intangible assets $ 7,000          
Trademarks & tradenames | Buffalo Filter LLC            
Business Acquisition [Line Items]            
Weighted average amortization period (in years) 20 years          
Pro Forma | Acquisition-related Costs | Cost of Sales            
Business Acquisition [Line Items]            
Business acquisition costs     200   1,300  
Pro Forma | Acquisition-related Costs | Selling and Administrative Expenses            
Business Acquisition [Line Items]            
Business acquisition costs     $ 1,500   $ 11,200